This is a bigger project that includes the following nodes:

• Formatter: StmtMatch #6298
• Formatter: MatchCase #6299
• Format PatternMatchAs #6641
• Format PatternMatchClass #6642
• Format PatternMatchMapping #6644
• Format PatternMatchOr #6643
• Format PatternMatchSequence #6645
• Format PatternMatchSingleton #6557
• Format PatternMatchStar #6558
• Format PatternMatchValue #6555
• Preserve pattern parentheses #6753
• Can omit parentheses layout for patterns #6933

The match arms have the same considerations for comments as if branches or try-except branches.